There is no documentation on how to un-`--defer` objects

The documentation for `az network` and a few other commands support a `--defer` parameter, which presumably is used to make it easier to form lists of things that would otherwise be awkward from a command line interface. Unfortunately, while there is documentation for `--defer` in the individual commands saying that they get put in the cache, and documentation for `az cache` which lets you list things in the cache or delete things, there is no documentation for how one can actually commit / send things to azure. The closest thing I've found to an example is this block from the coding guidelines : https://github.com/Azure/azure-cli/blob/dev/doc/command_guidelines.md#overcoming-service-limitations

Perhaps the docs for `az cache` should describe how things get submitted?

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#### Document Details

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* ID: bc99d572-abdb-ab6b-7a9a-c6951a1c1466
* Version Independent ID: 0a50e966-cbc8-8960-c01f-e117cac842d4
* Content: [az network vnet](https://docs.microsoft.com/en-us/cli/azure/network/vnet?view=azure-cli-latest)
* Content Source: [latest/docs-ref-autogen/network/vnet.yml](https://github.com/MicrosoftDocs/azure-docs-cli/blob/master/latest/docs-ref-autogen/network/vnet.yml)
* Service: **virtual-network**
* GitHub Login: @rloutlaw
* Microsoft Alias: **routlaw**